Dunno. It's even more black world than Copper Canyon and NASP history (have you ever seen any publication that covers entire NASP program history)? Multiply this on Soviet secrecy and voila...it's all to be written. For me, USSR was a real pioneer in this field with 50x50 Spiral project that was made by whom? - Yes, right, OKB MIG...so we can only imagine what happened when.